Door security device

Abstract

A door security device includes an elongate support bar, attachment mechanism mounted to the support bar, opposing blocking members attached to opposing ends of the support bar, and an actuation mechanism. The attachment mechanism includes a pair of generally J-shaped hooks which engage a portion of a door. The blocking members include a surface thereon which rests flush against the door frame. The actuation mechanism includes a handle assembly which is pivotally connected to the hooks. The handle assembly includes a camming surface thereon which contacts the support bar. The security device is actuated by positioning the hooks about the door and positioning the blocking members flush against the door frame. The handle is then pivoted, causing the camming surface to pivot about the support bar and pull the hooks away from the door and towards the support bar.

Description

BACKGROUND AND SUMMARY OF THE INVENTION

The present invention relates generally to door security devices. More particularly, the present invention relates to devices which mechanically prevent a door from being opened.

One-way doors, that is, doors that open by swinging in only one direction, are especially popular in commercial buildings, schools, and the like. They provide easy ingress and egress to and from the building. Out-swinging doors in schools and commercial buildings are often equipped with panic-bar handles. A panic-bar handle may include an elongated rod extending across the width of the door. By pushing against the rod, the door latch is released and the door may be opened. If a crowd of people are pushed up against the door, the weight of the crowd will depress the rod and the door will open. Similarly, if a person is in a hurry to open the door, the person need not stop to turn a conventional doorknob to unlatch the door. The person need only exert a force on the rod and the door will open.

One-way doors are also targets for burglars. Doors which open in an outward fashion can often be readily opened, even if locked. A pry bar or similar tool can be wedged between the door and the door frame, and the door can be pried open.

Thus, while the safety features of the out-swinging panic-bar door are desirable, the ease with which these doors may be broken into is a disadvantage. To reduce the threat of burglary, devices have been made which prevent out-swinging doors from being opened.

Devices are known which are permanently or semi-permanently attached to the door or door frame. For example, a support bar may be bolted to the door, across the door frame, preventing the door from being opened. Such an arrangement is shown in U.S. Pat. No. 4,856,831, issued to Roden, Jr. This type of arrangement, however, defeats the purpose of the panic-bar handle arrangement. If, under exigent circumstances, the door must be quickly opened, the permanent security device can not be readily removed, and the door can not be quickly opened.

Another drawback of known security devices is that many require additional hardware to be mounted to the door or door frame. This can require special tooling. Furthermore, it can be difficult and time consuming to mount these devices. Such devices may also leave permanent marks or otherwise deface the door once the devices have been removed.

Known security devices are also limited in that they can typically be used with only a particular door. Once the necessary hardware is attached to the door or door frame, the security device can only be used on that particular door. To use the security device on another door, the hardware must be removed from the first door and placed on the second door.

Thus, it is an object of the present invention to provide a door security device which is portable which prevents a door from being opened.

Another object of the present invention is to provide a door security device which is easy to install and remove.

A further object of the present invention is to provide a door security device which requires no special tooling to install or remove.

Yet another object of the present invention is the provision of a door security device which requires no additional hardware to install or remove.

A still further object of the present invention is to provide a door security device which can be readily used on doors equipped with panic-bar handles, as well as doors witch other types of handle hardware.

These and other objects are attained in a door security device which is secured to the inside of an out-swinging door. The security device generally includes an elongate support bar having first and second ends, the length of which typically exceeds a width of the door. Typically, the security device of the present invention is positioned in a substantially horizontal orientation such that the first and second ends of the support bar are disposed adjacent opposing vertical members of the door frame.

Attached to the first and second ends of the support bar are blocking members. The blocking members are designed to be positionable against the door frame. Each blocking member includes a surface thereon for contacting and resting against the door frame. Each blocking member also includes an adjustment mechanism which provides for adjustable positioning of the support bar with respect to the blocking member. In the illustrative embodiments shown, the adjustment mechanism includes a slot located within the blocking member. The slot is disposed substantially orthogonally to the longitudinal axis of the support bar, such that the support bar may translate within the slot parallel to the longitudinal axis of the slot. The adjustment mechanism also includes a threaded member which engages the blocking member and the support bar. The threaded member includes a knob or head, such that turning or actuating the knob causes the support bar to move within the slot relative to the blocking member.

The door security device of the present invention also includes an attachment means, which allows the device to removably engage a portion of a door. One illustrative embodiment of the attachment means includes a pair of generally J-shaped hooks. The hooks include an engagement portion and a generally elongate stem. The stem is disposed substantially through the support bar, and extends substantially orthogonally therefrom. The engagement portion of the hook is opposite the support bar, and is designed to engage a portion of the door. As the handle assembly is actuated, the engagement portion of the hook is drawn near the support bar, thereby exerting a force on a portion of the door.

The present invention also includes an actuation mechanism. In the illustrative embodiment shown, the actuation mechanism includes a handle assembly. The handle assembly includes a generally elongate rod disposed substantially parallel to the support bar, and spaced apart from the support bar. At opposite ends of the rod are elbow members which terminate adjacent the support bar. The elbow members are pivotally connected to the hooks. A pin connecting the elbow to the hook acts as a pivot point, allowing the elbow and thus the handle assembly to pivot with respect to the hook, and the support bar.

The security device of the present invention further includes a spring mechanism which provides tension against the handle assembly when the handle is actuated. The spring mechanism includes a washer which is attached to the hooks and a coil spring which is disposed about the hooks between the washer and the support bar.

The present invention also includes a camming surface which contacts a substrate to lock the device in place. Typically the substrate will be the support bar. In one illustrative embodiment, the camming surface pivots in response to actuation of the handle assembly. In this embodiment, the camming surface is located on the elbow member of the handle assembly. The point of pivotal connection between the elbows of the handle assembly and the hooks forms the pivot point for the camming surface.

The camming surface includes a first surface, a second angled surface, and a third surface. In the illustrative embodiments shown, the first surface and third surface are disposed substantially orthogonal to one another, and the angled surface connects the first surface to the third surface. In the embodiments shown, the angled surface extends at an angle approximately 45.degree. from the horizontal. As illustratively shown, the distance between the pivot point and the first surface is less than the distance between the pivot point and the angled surface, and the distance between the pivot point and the angled surface is less than the distance between the pivot point and the third surface. Thus, as the handle assembly is pivoted, the camming surface pivots about the pivot point, and the first surface, second angled surface, and third surface, in turn, contact the support bar.

In some instances, it may be desirable to coal portions or all of the security device. For example, it may be desirable to paint portions of the security device for aesthetic reasons. Also, it may be desirable to coat portions of the security device such that it does not scratch or cause damage to the door or door frame. Thus, portions of the blocking members and attachment means may be coated with a non-abrasive substance, so as not to scratch or cause damage to the door.

Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of the door security device of the present invention, shown mounted to a door.

FIG. 2 is a perspective view of a door security device of the present invention.

FIG. 3 is a side cut-away view of a blocking member of the present invention.

FIG. 4 is a side cut-away view of the present invention showing the attachment mechanism and spring mechanism.

FIG. 5 is a partial view of the handle assembly and support bar of the present invention, showing detail of the camming surface.

FIG. 6 is a plan view of another illustrative embodiment of the present invention, in conjunction with a door which does not utilize a panic bar.

FIGS. 7a through 7e show a series of views of the security device of the present invention as it is mounted to a door and actuated into a locked position.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1 shows a front view of a door security device in accordance with the present invention, generally indicated by the reference numeral 10. Security device 10 is designed to prevent a one-way door, that is, a door which opens in only one direction, from being opened. The device is positioned on the inside of an out-swinging door, and is a deterrent to burglars and others who may attempt to open the door without authorization. Security device 10 of the present invention is particularly compatible with a door equipped with a panic-bar handle.

Door 12 is typically mounted within door frame 14. Panic-bar handle assembly 16 includes rod 18, which extends substantially horizontally across the width of door 12. Security device 10 of the present invention is particularly designed for use with this type of handle hardware. However, it should be well understood that the present invention can also be used with doors having other types of handle hardware.

As can be seen in FIG. 2, security device 10 includes support bar 20, opposing blocking members 30, attachment means 50, and actuation mechanism 70. Support bar 20 is a generally elongate, rigid body. As shown in FIG. 2, support bar 20 may be generally rectangular in cross-section. However, support bar 20 may also be designed having a different cross-sectional configuration, and the present invention is not limited by the shape of the support bar. It is preferred that support bar 20 be rigid and sturdy, so as to withstand the forces which may be applied to the door by a burglar. Thus, one illustrative material from which support bar 20 may be constructed is steel. Support bar 20 may be substantially solid if extra strength is a concern, or it may be at least partially hollow, thus reducing the overall weight of security device 10.

Security device 10 includes two blocking members 30, one attached to each end of support bar 20. Blocking members 30 are designed to abut and rest flush against door frame 14, and thus it is desired that blocking members 30 be longitudinally spaced along support bar 20 by a distance equal to the width of door frame 14. Each blocking member 30 includes blocking surface 32 thereon. In the illustrative embodiments shown, blocking surface 32 is a substantially flat, planar surface. Blocking surface 32 is designed to abut and rest flush against door frame 14 when security device 10 has been mounted. Blocking members 30 insure that security device 10 is securely positioned against door frame 14, substantially perpendicular to the door frame. The dimensions of blocking member 30 and blocking surface 32 may be varied to create more or less bearing surface between the blocking member and the door frame. Blocking member 30 may be made from any suitable material, such as wood, plastic or the like.

Each blocking member 30 also includes a receiving means which receives an end of support bar 20. In the illustrative embodiment shown, the receiving means includes slot 34 therein. Slot 34 is substantially coplanar with and orthogonal to the longitudinal axis of support bar 20. Thus, support bar 20 may translate within slot 34 in a direction substantially orthogonal to the longitudinal axis of the bar.

Each end of support bar 20 is receivable within slot 34 in the receiving means. This secures blocking member 30 to support bar 20. A variable adjustment mechanism, such as threaded bolt 36, is housed within the receiving means. Threaded bolt 36 engages threaded portion 38 of support bar 20. Bolt 36 is axially fixed within slot 34 to plate 40, but is free to rotate. Bolt 36 includes knob 42 thereon, such that by turning knob 42 bolt 36 rotates, causing support bar 20 to translate within slot 34. This mechanism allows support bar 20 to be adjustably positioned relative to blocking member 30, within slot 34. This mechanism can been seen in FIG. 3.

Intermediate the opposite ends of support bar 20, security device 10 includes attachment means 50. Attachment means 50 provides the means by which the security device is removably attached to door 12. Attachment means 50 includes at least one hook 52, which is mounted to support bar 20 intermediate the ends of the support bar. The number of hooks 52 utilized may vary; the illustrative embodiments shown include two hooks 52 mounted to support bar 20. The present invention is not limited by the number of hooks 52 used, nor by the relative positioning of the hooks longitudinally on support bar 20.

Each hook 52 is generally J-shaped, and includes stem 54 and engagement portion 56. Stem 54 is substantially elongate and straight. The end of stem 54 opposite engagement portion 56 is disposed in an opening which extends through support bar 20, such that the hook extends substantially orthogonally from bar 20 toward door 12.

Engagement portion 56 physically engages a portion of door 12 when security device 10 is mounted thereto, in one illustrative embodiment, engagement portion 56 includes curve 58. Curve 58 transitions from stem 54 to form the generally J-shaped body. Curve 58 is positioned such that the "open" portion of the curve faces generally upward. This can be seen in FIG. 4.

As noted previously security device 10 also includes an actuation mechanism 70. In the illustrative embodiment shown, the actuation mechanism 70 includes handle assembly 71. Handle assembly 71 includes a generally elongate bar 72 which is disposed substantially parallel to support bar 20. At its opposite ends, bar 72 includes elbows 74 attached thereto. Each elbow 74 terminates adjacent support bar 20.

The end of elbow 74 which terminates adjacent support bar 20 is pivotally connected to attachment means 50. In the illustrative embodiment shown in FIG. 5, stem 54 of hook 52 extends substantially through support bar 20, and slightly outside of the support bar on the opposite side. Pin 80 is disposed substantially orthogonally through stem 54, and elbow 74 is connected to pin 80, such that elbow 74 may pivot or rotate about pin 80. This also allows elbow 74, and thus bar 72, to pivot with respect to support bar 20.

Elbow 74 includes a camming surface 76 thereon. Camming surface 76 contacts support bar 20 as bar 72 is pivoted with respect to bar 20. Camming surface 76 may be generally of any shape, including a rounded shape, an elliptical shape, or a multi-step shape. In the embodiments shown, camming surface 76 includes three discrete surfaces. Camming surface 76 generally includes first surface 82, angled second surface 84 and third surface 86. First surface 82 and third surface 86 are substantially orthogonal to one another, and are connected by angled surface 84. When security device 10 is in a rest position, prior to actuation, first surface 82 is substantially vertical and third surface 86 is substantially horizontal. Angled surface 84 extends generally at an angle of 45.degree. from both the horizontal and vertical. However, the angles at which first surface 82, angled surface 84 and third surface 86 are oriented are illustrative, and are not intended to limit the scope of the present invention. Camming surface 76 is shown in detail in FIG. 5.

FIG. 5 also shows the spatial relationship of pin 80 to camming surface 76. Pin 80 acts as a pivot point for camming surface 76. The perpendicular distance between pin 80 and each of the three surfaces on camming surface 76 is fixed; that is, the distance between pin 80 and first surface 82 is fixed, and may be represented by the letter "X," the distance between pin 80 and angled surface 84 may be represented by "Y," and the distance between pin 80 and third surface 86 may be represented by "Z." In the illustrative embodiments shown, X<Y<Z.

Security device 10 also includes spring mechanism Spring mechanism 90 includes washer 92, coil spring 94 and casing 96. Coil spring 94 is positioned about stem 54 of hock 52, adjacent support bar 20, such that the coil spring substantially surrounds stem 54. Washer 92 is secured to stem 54 adjacent one end of spring 94. The opposite end of coil spring 94 abuts support bar 20. Casing 96 surrounds coil spring 94, and prevents dirt or other debris from interfering with the workings of spring 94. Casing 96 is preferably flexible, such that it may contract and expand with coil spring 94.

Spring mechanism 90 acts as an aid to the release of security device 10 from an actuated position to a rest position. When security device 10 is actuated, coil spring 94 is compressed, exerting a force on support bar 20 and on washer 92. The force on washer 92 is directed substantially away from support bar 20, thus tending to push hook 52 away from the support bar, to a pre-actuation state. When a user releases handle assembly 70 of the present invention, the user is assisted in pushing bar 72 toward door 12 by the tension created by coil spring 94 against washer 92.

Security device 10 can be used in conjunction with door 12 having various types of handle hardware. For example, the present invention is compatible for use with door 12 having panic-bar handle 16 as a handle. The present invention is also compatible with doors having other types of handle hardware, such as a conventional door knob. When used with this type of door, the present invention also includes receiving means 60. Receiving means 60 is mounted to door 12, and engagingly receives attachment means 50 mounted on support bar 12. For illustrative purposes, receiving means 60 may include eyelets 62. In this embodiment, it is preferred that door 12 be equipped with an eyelet 62 to correspond to each hook 52 mounted on support bar 20. This embodiment is illustrated in FIG. 6.

Portions or all of security device 10 may be coated with various coatings. For example, portions or all of security device 10 may be painted to make the device more aesthetically pleasing. Also, other coatings may be applied to portions or all of the security device, such that the device does not scratch or otherwise harm door 12. Such coatings may be any non-abrasive coating or substance 95, as illustratively shown in FIG. 2, which deters or limits scratching or other effects caused by the rubbing of two surfaces together.

Directing attention now to FIG. 7, the ease with which security device 10 may be installed and removed can be easily appreciated. When it is desired to prevent door 12 from being opened, security device 10 may be used. In door 12 having panic-bar handle 16, security device 10 is positioned about handle 16 such that blocking surface 32 of blocking member 30 is adjacent door frame 14. This allows hook 52 to clear rod 18 of the panic-bar, and allows engagement portion 56 to receive rod 18 therein. Once the panic bar is received within hook 52, knob 42 may be turned, thereby adjusting the relative position of support bar 20 with respect to blocking member 30. At this point, security device 10 is prepared to be actuated. This is shown in FIG. 7c.

Security device 10 is actuated by pivoting handle assembly 71. A user may pivot bar 72 by grasping bar 72 and pulling it substantially away from door 12. As bar 72 is pivoting, the various surfaces of camming surface 76 on elbow 74 contact support bar 20. In the pre-actuation position, shown in FIG. 7c, first surface 82 rests substantially flush against support bar 20. As bar 72 is rotated, first surface 82 rotates away from the support bar and angled second surface 84 rotates into engagement, such that it rests substantially flush against support bar 20. This can be seen in FIG. 7d. When bar 72 is fully actuated, and pulled away from door 12 into a fully-operative position, third surface 86 rests substantially flush against support bar 20. This is shown in FIG. 7e. When security device 10 is in a fully-operative position, the positioning of handle 72 is easily viewable. Thus, a quick visual inspection insures that security device 10 is in position.

As bar 72 is actuated, and the various surfaces of camming surface 76 of elbow 74 rotate against support bar 20, hook 52 is drawn substantially away from door 12, toward support bar 20. This pulling action is effectively caused by increasing the distance between pin 80 and support bar 20. In the pre-actuation state, pin 80 is spaced from support bar 20 by a distance X, representing the distance between pin 80 and first surface 82. As bar 72 is rotated, the distance between pin 80 and support bar 20 is increased first to a distance Y, and finally to a distance Z, that distance between pin 80 and third surface 86. In this position, engagement portion 56 of hook 52 is pulled toward support bar 20 by a distance equal to the difference between X and Z.

Along with engagement portion 56, washer 92 is also pulled toward support bar 20. This exerts a force onto coil spring 94, and thus the spring is in a contracted position. The spring mechanism thus serves to tension the security device in place.

As engagement portion 56 of hook 52 is drawn toward support bar 20, rod 18 of panic bar handle 16 is pivoted slightly upward. This removes any mechanical slack which may be present in panic bar handle 16. Once this slack is removed, panic bar handle 16 is drawn towards support bar 20 by engagement portion 56 of hook 52. This pulling action also draws door 12 towards support bar 20. This pulling action draws door 12 snug against door frame 14, compressing against any weather stripping, mechanical slack or other spacing between door 12 and frame 14. This secures the door, such that there is little or no play or give between door 12 and frame 14.

Security device 10 is removed from engagement with door 12 by reversing the preceding steps of installation. A user grasping bar 72 can push the handle toward door 12, thus releasing third surface 86 from its flush alignment with support bar 20. The tension exerted on support bar 20 and washer 92 by coil spring 94 assists the user in pushing support bar 20 towards door 12. Camming surface 76 on elbow 74 transitions through angled second surface 84 and first surface 82, until the first surface rests substantially flush against support bar 20. In this position, the tension on coil spring 94 is released and security device 10 may be quickly and easily removed from engagement with the door hardware. In practice, only a small force need be applied to bar 72 to release security device 10. Once released, security device 10 will fall to the floor if not otherwise held during removal. Thus, security device 10 can be quickly and easily removed from its locked position in case of a panic situation.

Security device 10 of the present invention can be installed and removed in a similar manner when used on doors 12 having a knob handle or other handle hardware. In these instances, eyelets 62 are secured to the door, and act as a receiving mechanism for hooks 52. When security device 10 is to be mounted on such a door, hooks 52 are positioned such that engagement portion 56 is inserted through eyelets 62, and the eyelets are secured adjacent curve 58 of hook 52. Security device 10 is then positioned and actuated as recited above.

From the preceding description of the illustrative embodiments of the invention, it is evident that the objects of the invention have been attained. Although this invention has been described and illustrated in detail, it is to be clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation. Therefore, the spirit and scope of this invention are to be limited only by the terms of the appended claims.

Claims

1. A security device for a door mounted within a frame, comprising:

a generally elongate support bar having first and second ends, said support bar having a length which exceeds a width of said door;

means mounted to said support bar for removably attaching said device to a portion of said door in a substantially horizontal orientation such that said first and second ends of said support bar are disposed adjacent opposing vertical members of said door frame;

a first blocking member attached to said first end of said support bar and a second blocking member attached to said second end of said support bar, said blocking members being positionable against said door frame; and

a handle assembly mounted to said attaching means adjacent said support bar, such that said handle assembly is pivotable with respect to said support bar so as to engage said attaching means to said portion of said door.

2. The device according to claim 1, including spring mechanism means attached to said device adjacent said attaching means for providing tension against said handle assembly.

3. The device according to claim 2, wherein said spring mechanism means includes a washer secured to said attaching means, a coil spring disposed about said attachment means between said washer and said support bar, and a casing disposed about said coil spring.

4. The device according to claim 1, wherein said handle assembly is configured to include a camming surface for contacting said support bar during actuation of said handle assembly, said camming surface pivoting in response to the pivoting action of said handle assembly.

5. The device according to claim 4, including a pivot point about which said camming surface pivots in response to actuation of said handle assembly.

6. The device according to claim 5, wherein said camming surface includes a first surface, an angled second surface, and a third surface.

7. The device according to claim 6, wherein the distance between said pivot point and said first surface is less than the distance between said pivot point and said angled second surface is less than the distance between said pivot point and said third surface.

8. The device according to claim 7, wherein each of said first, second and third surfaces contacts, in turn, said support bar as said handle assembly is pivoted.

9. The device according to claim 8, wherein said handle assembly includes a generally elongate rod spaced apart from said support bar and opposing elbow members connected to opposite ends of said rod and attached to said attachment means adjacent said support bar.

10. The device according to claim 9, wherein said camming surface is located on said elbow, adjacent said support bar.

11. The device according to claim 7, wherein actuation of said handle assembly causes said attachment means to draw near said support bar.

12. The device according to claim 11, wherein said attachment means is drawn towards said support bar by a distance approximately equal to the difference between said pivot point and said first surface and said pivot point and said third surface.

13. The device according to claim 1, wherein said blocking members include a surface thereon for contacting and resting against said frame of said door.

14. The device according to claim 13, wherein said blocking members include an adjustment mechanism for adjustably positioning said support bar with respect to said blocking member.

15. The device according to claim 14, wherein said adjustment mechanism includes a slot within said blocking member, said slot being disposed substantially orthogonally to the longitudinal axis of said support bar, such that said support bar may translate within said slot parallel to the longitudinal axis of said slot.

16. The device according to claim 15, wherein said adjustment mechanism includes a threaded member engageable with said blocking member and said support bar, whereby actuation of said threaded member causes said support bar to move within said slot relative to said blocking member.

17. The device according to claim 1, wherein said attaching means includes at least one hook, said hook extending substantially through said support bar.

18. The device according to claim 17, wherein said hook includes an engagement portion disposed opposite said support bar, said engagement portion for engaging a portion of said door.

19. The device according to claim 18, wherein said hook is pivotally attached to said handle assembly, such that actuation of said handle assembly causes said handle assembly to pivot with respect to said hook.

20. The device according to claim 19, whereby pivotally actuating said handle assembly draws said engagement portion of said hook towards said support bar.

21. A security device for a door mounted within a frame, comprising:

a generally elongate support bar having first and second ends;

attachment means mounted to said support bar for removably attaching said security device to a portion of said door in a substantially horizontal orientation such that said first and second ends of said support bar are disposed adjacent opposing vertical members of said door frame; and

an actuation mechanism connected to said attachment means, said actuation mechanism including a camming surface, such that said camming surface is engageable with

the support bar to secure said security device in position with respect to said door.

22. The device according to claim 21, wherein said actuation mechanism includes a handle assembly pivotally connected to said attachment means.

23. The device according to claim 22, wherein said camming surface is located on said handle assembly.

24. The device according to claim 23, including a pivot point about which said camming surface pivots in response to actuation of said handle assembly.

25. The device according to claim 24, wherein said camming surface includes a first surface, an angled second surface, and a third surface.

26. The device according to claim 25, wherein the distance between said pivot point and said first surface is less than the distance between said pivot point and said angled second surface, and further wherein the distance between said pivot point and said angled second surface is less than the distance between said pivot point and said third surface.

27. The device according to claim 26, wherein pivotal actuation of said handle assembly causes said camming surface to pivot such that said first, second and third surfaces contact, in turn, said support bar.

28. The device according to claim 27, wherein said first surface and said third surface are disposed substantially orthogonal to one another.

29. The device according to claim 28, wherein said angled second surface is angled approximately 45.degree. from the horizontal.

30. The device according to claim 21, wherein at least portions of said device are covered by a coating.

31. The device according to claim 30, wherein said coating is paint.

32. The device according to claim 30, wherein said coating is a non-abrasive material.